The victims also offer a lot of potential. There could be a victim who is not as helpless as the others and tries to fight back in clever ways. Their struggle against the killers can make for a great story.
Percy and Annabeth are always interesting to focus on. Their relationship is central to the story, and in the House of Hades, there are so many opportunities to explore their bond further. They are both strong, yet vulnerable in different ways. Nico di Angelo is also a great character to focus on. His past and his connection to the underworld give him a unique perspective. Plus, his powers are really cool. Another interesting character could be Bob, the Titan. He has a complex personality and his loyalty to Percy and the others adds an interesting dynamic.
Percy and Annabeth are always interesting. Their relationship is central to the series, and in the House of Hades, they face extreme challenges that can be explored further. Their love and loyalty to each other can be put to the test in different ways. For example, when they are separated, how do they each cope and still strive towards their common goal? Another interesting character is Nico. He has a deep connection to the underworld and his own complex backstory. In the House of Hades, his powers and knowledge could be further developed in fanfiction.
Leni could be a fun character to center around. Since she's not always the brightest, a message that she misinterprets in her own unique way could lead to all kinds of humorous situations. For example, if the message is about a fashion show, she might think it's something completely different and start preparing for a very strange event.
Fabian Rutter is also a great choice. He's intelligent and often involved in solving the mysteries. A fanfiction could explore his relationships more deeply, like his friendship with Nina or his family background which was hinted at in the show but not fully explored.
Jenna is obviously a key character. You can explore her character further, like what if she had different reactions to becoming 30 in the fanfiction? Maybe she's more scared or more excited than in the movie.
In The Mummy 2017 fanfiction, I think the character with the most potential is the mummy. Her character has so much mystery surrounding it. You can write about her from different perspectives, like as a vengeful spirit or as a victim of a cruel fate. Then there's the female lead. She can be developed more in fanfiction, perhaps having a more in - depth relationship with the mummy, either as an enemy or as someone who tries to understand her. And don't forget the villainous characters. They can be made more complex, with their own motives and backstories that tie into the overall story of the mummy.
Barnabas Collins is a very popular character to focus on. His complex nature, being a vampire, and his internal struggles make him a fascinating subject. Another popular one is Angelique, with her powerful witchcraft and her tumultuous relationship with Barnabas. And then there's Quentin Collins, with his own dark secrets and the mystery surrounding him.
Laura Ingalls is definitely one of the most popular characters to focus on. Her adventurous spirit and strong will make for great fanfiction stories. Almanzo Wilder is also a favorite. His relationship with Laura and his own skills as a farmer provide a lot of material. Another popular character is Mary Ingalls. Her journey from a sighted girl to losing her vision and how she copes can be explored in depth in fanfiction.
José is also a character with potential. He was Ana's friend from the start and had some unrequited feelings for her. In a fanfiction, you could develop his character more, perhaps showing how he has coped with Ana choosing Christian. Maybe he tries to re - enter Ana's life in a more positive way, which causes some friction in Ana and Christian's relationship.
Wilbur Robinson is a great character to focus on. He's adventurous and has that cool time - machine. You can explore his relationship with his family more deeply, like how he tries to fit in with all their eccentricities. Another interesting character is Lewis. His journey from being an orphan to finding a family in the Robinsons is full of potential for further exploration in fanfiction.